Wireless screen sharing?

Disregard the home automation topic, which is cool in itself, but I am interested in how they have the tab connected to the display without it being plugged in. Do you think there is a way to do this, or is it just trickery of someone else doing the navigation and hooked up via hdmi?

After a lot of searching, it looks like the only way to do this is with Droid VNC Server on a rooted device. In this video, however, I am guessing they just simulate it by having someone else navigate on a device connected via hdmi.